AMDGPU.h - reduce TargetMachine.h include. NFC.

Replace TargetMachine.h include with forward declaration and CodeGen.h include in AMDGPU.h.

Exposes a couple of implicit dependencies that require additional forward declarations/includes.

lib/Target/AMDGPU/AMDGPU.h

@@ -10,15 +10,16 @@
 #ifndef LLVM_LIB_TARGET_AMDGPU_AMDGPU_H
 #define LLVM_LIB_TARGET_AMDGPU_AMDGPU_H
 
-#include "llvm/Target/TargetMachine.h"
 #include "llvm/IR/IntrinsicsR600.h" // TODO: Sink this.
 #include "llvm/IR/IntrinsicsAMDGPU.h" // TODO: Sink this.
+#include "llvm/Support/CodeGen.h"
 
 namespace llvm {
 
 class AMDGPUTargetMachine;
 class FunctionPass;
 class GCNTargetMachine;
+class ImmutablePass;
 class ModulePass;
 class Pass;
 class Target;

lib/Target/AMDGPU/AMDGPUFixFunctionBitcasts.cpp

@@ -15,6 +15,7 @@
 
 #include "AMDGPU.h"
 #include "llvm/IR/InstVisitor.h"
+#include "llvm/Pass.h"
 #include "llvm/Transforms/Utils/CallPromotionUtils.h"
 
 using namespace llvm;

lib/Target/AMDGPU/AMDGPUHSAMetadataStreamer.h

@@ -27,6 +27,7 @@ class AMDGPUTargetStreamer;
 class Argument;
 class DataLayout;
 class Function;
+class MachineFunction;
 class MDNode;
 class Module;
 struct SIProgramInfo;

lib/Target/AMDGPU/AMDGPUISelLowering.h

@@ -18,6 +18,7 @@
 #include "AMDGPU.h"
 #include "llvm/CodeGen/CallingConvLower.h"
 #include "llvm/CodeGen/TargetLowering.h"
+#include "llvm/Target/TargetMachine.h"
 
 namespace llvm {
 

lib/Target/AMDGPU/AMDGPUPerfHintAnalysis.cpp

@@ -28,6 +28,7 @@
 #include "llvm/IR/Module.h"
 #include "llvm/IR/ValueMap.h"
 #include "llvm/Support/CommandLine.h"
+#include "llvm/Target/TargetMachine.h"
 
 using namespace llvm;